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SQL Exercise: Employees with s as their 3rd character in first name

SQL SORTING and FILTERING on HR Database: Exercise-19 with Solution

19. From the following table, write a SQL query to find those employees whose first name contains a character 's' in the third position. Return first name, last name and department id.

Sample table : employees


Sample Solution: 

SELECT first_name,last_name, department_id
 FROM employees
  WHERE first_name LIKE '__s%';

Sample Output:

 first_name  | last_name | department_id
-------------+-----------+---------------
 Jose Manuel | Urman     |           100
 Jason       | Mallin    |            50
 Joshua      | Patel     |            50
 Lisa        | Ozer      |            80
 Susan       | Mavris    |            40
(5 rows)

Code Explanation:

The said query in SQL which retrieves the first name, last name, and department ID columns from the 'employees' table where the value in the "first_name" column starts with two characters followed by "s".
In this case, the result will be a set of rows in the 'employees' table that match the specified pattern based on the first name.

Relational Algebra Expression:

Relational Algebra Expression: Display the first and last name, department number for those employees who holds a letter s as a 3rd character in their first name.

Relational Algebra Tree:

Relational Algebra Tree: Display the first and last name, department number for those employees who holds a letter s as a 3rd character in their first name.

Practice Online


HR database model

Query Visualization:

Duration:

Query visualization of Display the first and last name, department number for those employees who holds a letter s as a 3rd character in their first name - Duration

Rows:

Query visualization of Display the first and last name, department number for those employees who holds a letter s as a 3rd character in their first name - Rows

Cost:

Query visualization of Display the first and last name, department number for those employees who holds a letter s as a 3rd character in their first name - Cost

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Previous SQL Exercise: Employees earn over 11000 or 7th digit in their phone.
Next SQL Exercise: Find employees who is working except given departments.

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SQL: Tips of the Day

Difference between natural join and inner join

One significant difference between INNER JOIN and NATURAL JOIN is the number of columns returned-

Consider:

TableA                           TableB
+------------+----------+        +--------------------+    
|Column1     | Column2  |        |Column1  |  Column3 |
+-----------------------+        +--------------------+
| 1          |  2       |        | 1       |   3      |
+------------+----------+        +---------+----------+

The INNER JOIN of TableA and TableB on Column1 will return

SELECT * FROM TableA AS a INNER JOIN TableB AS b USING (Column1);
SELECT * FROM TableA AS a INNER JOIN TableB AS b ON a.Column1 = b.Column1;

+------------+-----------+---------------------+    
| a.Column1  | a.Column2 | b.Column1| b.Column3|
+------------------------+---------------------+
| 1          |  2        | 1        |   3      |
+------------+-----------+----------+----------+

The NATURAL JOIN of TableA and TableB on Column1 will return:

SELECT * FROM TableA NATURAL JOIN TableB
+------------+----------+----------+    
|Column1     | Column2  | Column3  |
+-----------------------+----------+
| 1          |  2       |   3      |
+------------+----------+----------+

Ref: https://bit.ly/3AG5CId

 

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